a²-2b-3=0 a²-2b+1=4 a-b=2; 2a²-4b+5=2(a-b)²+3=8+3=11
ax²+bx=3,4a+2b=3
(8a+4b)²-6a-3b+3=4(4a+2b)²-3(2a+b)+3=4x9-3x3/2+3